From 4b2610c46820007f26b7bbce962180483bd6444e Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 14 Nov 2019 11:50:16 -0500
Subject: [PATCH] fix: handle empty lines in codeframe

---
 packages/shared/src/codeframe.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/shared/src/codeframe.ts b/packages/shared/src/codeframe.ts
index 3ffb2808a..890675432 100644
--- a/packages/shared/src/codeframe.ts
+++ b/packages/shared/src/codeframe.ts
@@ -20,7 +20,10 @@ export function generateCodeFrame(
         if (j === i) {
           // push underline
           const pad = start - (count - lineLength) + 1
-          const length = end > count ? lineLength - pad : end - start
+          const length = Math.max(
+            0,
+            end > count ? lineLength - pad : end - start
+          )
           res.push(`   |  ` + ' '.repeat(pad) + '^'.repeat(length))
         } else if (j > i) {
           if (end > count) {